One of the key ideas in forest gardening is the use of multiple layers to make the most use of the available space. It is intended to reflect natural woodland ecosystems. The vertical layer made up of climbers and vines is one of those layers and whilst I was walking in the woods this weekend I saw a great example of climbers reaching right up into the canopy. You can see them in the photo below, behind the large tree growing right up out of the shot. In the foreground is a clump of hazel stems. I haven't included much in the way of climbers into the garden yet, but plan to once the trees are better established.